19F NMR Spectroscopy for the Quantitative Analysis of Carbonyl Groups in Lignins
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R.M. Sevillano
Summary
The amount of carbonyl groups in an organosolv lignin was determined by 19F NMR spectroscopy after different derivatizations: derivatization with trifluoromethylphenylhydrazine, fluorobenzoylation of alcohol groups formed after NaBH4 reduction of lignin, fluorobenzoylation of phenolic hydroxyl groups after catalytic hydrogenation of lignin. Oximation was also used for comparison. Carbonyl group contents determined by 19F NMR after trifluoromethylphenylhydrazine derivatization were in good correlation with results from other methods. Trifluoromethylphenylhydrazine derivatization is a fast and easy technique, which provides a distinct quantification of aldehyde, ketone and quinone groups. Some round robin lignins (Milne et al. 1992), using trifluoromethylphenylhydrazine derivatization and modified oximation (Zakis 1994) provided significantly higher carbonyl group contents than the round robin test data, which had been measured either by classical oximation or by reduction-UV methods. Other recently reported carbonyl group estimations on round robin lignins (Faix et al. 1998; Ahvazi et al. 1999) were either in agreement or in disagreement with the herein-presented results. This indicates that carbonyl group analysis in lignins is difficult and that care must be taken when selecting an appropriate method.
Copyright © 2001 by Walter de Gruyter GmbH & Co. KG
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- Literature Reports
Articles in the same Issue
- Characterisation of Fungal Degraded Birch Wood by FTIR and Py-GC
- The Effects of Specific Volatile Organic Compounds Produced by Trichoderma Spp. on the Growth of Wood Decay Basidiomycetes
- Biological Control of Blue Stain in Pulpwood: Mechanisms of Control used by Phlebiopsis gigantea
- Cell-Wall-Associated Peroxidases from the Lignifying Xylem of Angiosperms and Gymnosperms: Monolignol Oxidation
- Laboratory Evaluation of Natural Decay Resistance and Efficacy of CCA-Treated Rubberwood (Hevea brasiliensis Muell. Arg.)
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- Lipophilic Extractives from Eucalyptus globulus Pulp during Kraft Cooking Followed by TCF and ECF Bleaching
- Determination of Monosaccharide Composition of Eucalyptus globulus Wood by FTIR Spectroscopy
- Acetyl Group Distribution in Acetylated Wood Investigated by Microautoradiography
- Solid State NMR Analysis of β-13C-Enriched Lignocellulosic Material During Light-Induced Yellowing
- N-Hydroxy Compounds as New Internal Standards for the 31P-NMR Determination of Lignin Hydroxy Functional Groups
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- Structural Analysis of Residual and Technical Lignins by 1H-13C Correlation 2D NMR-Spectroscopy
- Experimental Determination of Stiffness Variation Across Growth Rings in Picea abies
- Determination of the Material Property Variations Across the Growth Ring of Softwood for Use in a Heterogeneous Drying Model Part 1. Capillary Pressure,Tracheid Model and Absolute Permeability
- Surface Area Determinations in Woodpulps by Humidity Adsorption
- A Simple Testing Method for the Measurement of the Water Vapour Transmission of Coated Wood Longitudinal and Tangential to Grain Direction
- Literature Reports
